/* Software License Agreement
 * 
 *     Copyright(C) 1994-2019 David Lindauer, (LADSoft)
 * 
 *     This file is part of the Orange C Compiler package.
 * 
 *     The Orange C Compiler package is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     The Orange C Compiler package is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License
 *     along with Orange C.  If not, see <http://www.gnu.org/licenses/>.
 * 
 *     As a special exception, if other files instantiate templates or
 *     use macros or inline functions from this file, or you compile
 *     this file and link it with other works to produce a work based
 *     on this file, this file does not by itself cause the resulting
 *     work to be covered by the GNU General Public License. However
 *     the source code for this file must still be made available in
 *     accordance with section (3) of the GNU General Public License.
 *     
 *     This exception does not invalidate any other reasons why a work
 *     based on this file might be covered by the GNU General Public
 *     License.
 * 
 *     contact information:
 *         email: TouchStone222@runbox.com <David Lindauer>
 * 
 */

#include <stdio.h>
#include <stdlib.h>
int _RTL_FUNC setvbuf(FILE *restrict stream, char *restrict buf, int mode, size_t size)
{
    if (stream->token != FILTOK || !(stream->flags & _F_VBUF))
    {
        return 1;
    }
    switch (mode) {
        case _IOFBF:
        case _IOLBF:
        case _IONBF:
            break;
        default:
            return 1;
    }
    if (fflush(stream))
    {
        stream->flags |= _F_VBUF;
        return 1;
    }
    stream->flags |= _F_VBUF;
    if (stream->flags & _F_BUF)
        free(stream->buffer);
    stream->flags &= ~(_F_BUF | _F_LBUF);
    switch (mode) {
        case _IOLBF:
            stream->flags |= _F_LBUF;
        case _IOFBF:
            if (!buf) {
                buf = malloc(size);
                if (!buf)
                    return 1;
                stream->flags |= _F_BUF;
            }
            stream->buffer = buf;
            stream->bsize = size;
            break;
        case _IONBF:
            stream->buffer = 0;
            stream->bsize = 0;
            break;
        default:
            return 1;
    }
    stream->level = 0;
    return 0;
    
}